diff --git a/gemfiles/Gemfile.ruby-19 b/gemfiles/Gemfile.ruby-19
index a649a27e..aedf7516 100644
--- a/gemfiles/Gemfile.ruby-19
+++ b/gemfiles/Gemfile.ruby-19
@@ -11,4 +11,5 @@ gem 'tins', '< 1.7.0'  # 1.7.0 requires ruby 2.0
 
 gem 'selenium-webdriver', '< 3.0.0' # 3.0 requires ruby 2.0
 gem 'addressable', '< 2.5.0' # 2.5 requires public_suffix which requires ruby 2.0
-gem 'nokogiri', '< 1.7.0' # 1.7 requires ruby 2.1+
\ No newline at end of file
+gem 'nokogiri', '< 1.7.0' # 1.7 requires ruby 2.1+
+gem 'rack', '<2.0' # 2.0 requires ruby 2.2+
\ No newline at end of file
diff --git a/gemfiles/Gemfile.ruby-20 b/gemfiles/Gemfile.ruby-20
index e5d1c9d1..b785de10 100644
--- a/gemfiles/Gemfile.ruby-20
+++ b/gemfiles/Gemfile.ruby-20
@@ -5,3 +5,4 @@ gemspec path: '..'
 
 gem 'xpath', :git => 'git://github.com/jnicklas/xpath.git'
 gem 'nokogiri', '< 1.7.0' # 1.7 requires ruby 2.1+
+gem 'rack', '<2.0' # 2.0 requires ruby 2.2+